Fabrication of highly ordered Ta2O5and Ta3N5nanorod arrays by nanoimprinting and through-mask anodization
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Using highly ordered porous anodic alumina membrane fabricated with the aid of nanoimprinting as a mask, Ta2O5 nanorod array with uniform diameter, length, and distribution is grown in situ on a Ta substrate by through-mask anodization. The Ta2O5 nanorod array is further transformed into Ta3N5 nanorod array without damaging the nanorod structure by nitridation. Solar-driven photoelectrochemical water splitting with a maximum solar energy conversion efficiency of 0.36% is demonstrated with the Ta3N5 nanorod array after modifying the surface with cobalt-phosphate as a co-catalyst. The Ta2O5 and Ta3N5 nanorod arrays have potential applications in catalysis, photonics, UV photodetection and solar energy conversion.Keywords:
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Arrays of ordered nanorods are of special interest in many fields. However, it remains challenging to obtain such arrays on conducting substrates in a facile manner. In this article, we report the fabrication of highly ordered and vertically standing nanorod arrays of both metals and semiconductors on Au films and indium tin oxide glass substrates without an additional layering. In this approach, following the simple hydrophilic treatment of an anodic aluminum oxide (AAO) membrane and conducting substrates, the AAO membrane was transferred onto the modified substrates with excellent adhesion. Subsequently, nanorod arrays of various materials were electrodeposited on the conducting substrates directly. This method avoids any expensive and tedious lithographic and ion milling process, which provides a simple yet robust route to the fabrication of arrays of 1D materials with high aspect ratio on conducting substrates, which shall pave the way for many practical applications in a range of fields.
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In this paper, the fabrication of high aspect ratio 3-dimensional titania (TiO2) nanostructures based on costeffectively hydrothermal synthesis method is presented. A novel patterning method to overcome the tradeoff between tall trunks (nanorods) and large spacing is addressed. Polydimethylsiloxane (PDMS) was adopted to restrain the growth of the trunks (nanorods) of nanoforests to well control the morphology and surface area of TiO2 nanoforests.
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In the present work, ZnO nanorods and ZnO/GO/CNT nanocomposite have been prepared by microwave assisted method using various time of incorporation of GO/CNT. The structural and optical characterizations were performed by X-ray diffraction (XRD), Scanning electron microscope (SEM), UV-Visible spectrometer (UV-Vis) and Photoluminescence (PL). The XRD data showed that the most intense peak at 36° belong to (101) plane of ZnO nanorods. SEM results showed the formation of nano rods assembled in flower like structure. UV spectra shows that the samples absorb ultraviolet light and had a band gap value of 3.1-3.2 eV. The PL spectra showed the lowest PL intensity band for ZnO/GO/CNT-A. Higher photocatalytic degradation of 91% was determined in ZnO/GO/CNT composite when GO/CNT was added at the end of the procedure.
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Optical sensing based on plasmonic nanorod arrays witnesses an increased interest for device applications due to a manifold of benefits of these structures, such as broadband optical tunability and low-cost bottom-up fabrication. Key to this success is the assembly of nanorod antenna arrays mediated through high-quality anodized aluminum oxide (AAO) matrices. The present work reports the greatly improved fabrication of thin-film AAO matrices based on aluminum thin-films deposited by magnetron sputtering under controlled argon/oxygen atmosphere, and investigates the influence of oxygen on the aluminum morphology and hence AAO pore formation upon anodization. Such optimized templates then subsequently allow the fast and reproducible fabrication of nanorod arrays with a nearly 100% pore-filling degree, which is favorable in plasmonic applications, with the plasmonic properties greatly benefiting from homogeneous distances between neighboring nanorods. For an optimal oxygen content of 10–22 at.%, we find the long-axis plasmon resonance peak to show the least optical losses, confirming the optimized nanostructure fabrication and performance.
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We describe an electrochemical-based approach to create vertically aligned nanotube arrays on substrates. Initially, nanoporous anodic alumina films are used as templates to electrodeposit nanorods, and then the alumina templates are removed and nanotube arrays are electrodeposited using the nanorod arrays as templates. We have used this approach to fabricate gold nanotube arrays using nickel nanorods as templates. By anodizing the ends of the nickel nanorods before gold electrodeposition, no deposition occurs at the ends of the rods, resulting in open-ended nanotubes. In addition, we have used layered nickel-gold nanorods as templates to create gold nanostructure arrays with alternating segments of filled and empty nanotubes. This approach is versatile and may be used to electrodeposit a wide range of nanotube materials with good control over the nanotube dimensions.
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